#bttop{
    border:1px solid #4adcff;
    background:#24bde2;
    text-align:center;
    padding:5px;
    position:fixed;
    bottom:35px;
    right:10px;
    cursor:pointer;
    display:none;
    color:#fff;
    font-size:11px;
    font-weight:900;
}
#bttop:hover{
    border:1px solid #ffa789;
    background:#ff6734;
}